Machine for making plant protectors



June 18, 1935. w. R. SCHINDLER 2,005,326

MACHINE FOR MAKING PLANT PROTECTORS Filed Dec. 9, 1933 Patented June 18, 1935 UNITED STATES MACHINE FOR MAKING PLANT raocrao'roas Walter R. Schindler, Los Angeles, Calif. 1 Application December 9, 1933, Serial No. 701,642-

4 Claims.

' This invention relates broadly to machines for manufacturing articles from paper and other similar thin sheet materials and has to do particularly with the manufacture of paper plant protectors.

' Abroad object of the'inven'tion is, to provide a machine for continuously manufacturing paper'receptacles from continuous rolls of paper, thereby increasing the speedof operation and reducing the expense ofmanufacture.

Another object is to continuously manufacture paperv plant protectors from continuous rolls of paper in such a manner as to utilize all of the papenthereby eliminating any waste. Other objects and features of the invention will be apparent from the following detailed description whichrefers to the drawing.

In the drawing: I e

Fig. 1 isa side view of a plant protector manufactured in accordance with the invention, the protector being in flat form asit comes from the manufacturing machine; I v --Fig. 2 is an elevation view ofaplant pro.- tectorinaccordance with the invention after it has been opened outand the base portionspread ready-for. use; I Fig. 3 is a. detail sectionalview of Fig. 1 in the plane IIIIII, showing how the edges of the two sheets of paper from which the plant protector is made are joined together;

Fig. 4 is a schematic diagram of a machine in accordance with my invention for continuously manufacturing protectors such asare shown in Figs. 1:2 and 3; I

-Figr5 is a plan. view of a portion of j the machine depicted in Fig. 4, indicating how the two sheets of paper are pasted together after they pass through the compression rollers of the machine and showing the shape of the knife for cutting the sheet following the pasting operation; and I Fig. 6 is a plan view of the pasting roller of the machine. a v

Referring first toFigs. 1 and 3, a completed plant protector adapted to be manufactured in accordance with the machine of the present invention comprises a pair of triangular sheets I and 2 glued together along their lateral edges, as shown at 3 in Fig. 1. These sheets I and 2 constitute the walls of the protector and are preferably made of a thin translucent material. The sheets I and 2 are reinforced with strips 4 of heavier paper glued throughout their length to the sheets I and 2, respectively. The bottom edge 0f? each sheet, I and 2 is slitted, .as

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shown at 5 in Fig. 1, and the protector is shaped for use by buckling the sheet members land .2 into conical shape and then folding outthe slitted lower margin of each sheet, as shown in Fig. 2. The protector whenplaced in posi- .5 tion in the field is retained in position by banking the soil over the .bent out base segments formed by the slits 5. As shown in Figs. 1 and 2, the glued margins on the lateral edges of each sheet do not come completely together at thetop so that when the protector is shaped for use there is an aperture in the top for ventilation. However, this construction is optional and if desired the glued marginal areas may be brought together at the top to formja closed tip. v e

The flat plant protectors, as show n in Fig. 1, may be continuously manufactured with a machine in accordance with the schematic diagram of Fig. 4, in which two stripsof paper I and 2, respectively, (from which the wall members I and 2 of the protectors are formed) are continuously fed from a pair of paper rolls Band "I, respectively. The strips I" and 2' are'first brought together and compressed against each other by a pair of rollers 8 and 9, respectively, and thereafter pass between a second .pair of rollers II] and II, respectively, after which they pass between'a knife roller I2 and an anvil roller I3, which cut the sheets into the triangu 3O lar shapeshown in Fig. 1., I

The lower strip 2' passes directly from the roll of paper I to the compression rollers 8 and 9 but the upper strip I passes...over a glue applying roller I4 before reachingthe compression rollers 8,. and 9. This gluing roller I4 -is particu-' larly. designed to apply glueonly to narrow strip portions extending triangularly across the strip 2. To this end, it is constructed as shown in Fig. -6 and comprises a main cylindrical portion I5 having a pairof helicalribs I6and I'I extending from one end of the roller to the opposite end so that if glue is first applied to the facesof ribs I6 and I! and the roller then ro- 45 tated in synchronism with the paper strip I as the latter moves. thereover, the glue is transferred from the rib I 6 to the under face of the strip I along diagonal strip areas,- as shown at 3 in Fig. 5. Glue is continuously'applied to the faces of the rib I6 by atransfer roller, I8 positioned below the roller I4 and adapted to contact with the faces of the ribs I6 and II as the roller I4 rotates. The transfer roller I8 dips into glue in a receptacle I9 so that the coating of glue on the surface of transfer roller I8 is continuously replenished.

The paper bands 4 are also continuously applied to the outer surfaces of the paper strips I' and 2 by feeding these bands from supply rolls 2D and 2|, respectively, over glue transfer rollers 22 and 23, respectively, to the compression rollers 8 and 9, so that as the bands I and 2' and the reinforcing bands 4 pass between the compression rollers 8 and 9, and I and H, they are firmly united to each other, the bands 4 being glued throughout their lengths to their associated bands I' and 2' and the bands I and 2' being glued together along. the diagonally extending strips 3, as shown in Fig. 5. As shown in Fig. 4, only two sets of pressure rollers 8 and 9, and II] and II, respectively, are shown but it is to be understood that additional sets of rollersmay be introduced between these two sets of rollers if necessary to secure proper bonding between the various strips.

By the time the strips leave the last pressure rollers 10 and II, the glue has set sufficiently to permit the cutting of the blanks, which cutting operation is eifected by the kniferoller 12 working against the anvil roller l3. The construction of the knife roller I2 is shown to best advantage in Fig. 5. It comprises a cylindrical base roller 24 having a pair of helical knife edges 25 and 26, respectively, extending in opposite directions about the roller from one end to the other, the shapes of the knives 25 and 2E corresponding exactly to the shapes of the ribs l6 and I! on the gluing roller M. In addition, the roller [2 is provided with short knife edges 21 at each end for cutting the slits (Fig. 1).

The gluing roller I4 and the cutting roller I2 are driven at the same peripheral speeds and are so phased that the knives 25 and 26 cut the paper strips substantially along the center lines of the diagonal glued strips 3, thereby continuously delivering blanks of the configuration shown in Fig. 1.

Although any desired mechanism may be employed for synchronously driving the paper strips and rollers, a simple and effective mechanism for this purpose'includes a driving chain 28 meshing with sprockets on the rollers l4, 8, land l2, idler rollers 29 and 30 being provided to maintain the chain in engagement with the sprockets on the rollers 8 and Ill. As shown in the sketch, the complete assembly is driven by another sprocket on the roller H which is coupled by a chain 3| to an electric motor 32.

In the apparatus shown only the upper rollers 8, l0 and I2 are shown positively driven. However, it may be advantageous under certain conditions to insure more positive operation to also drive the cooperating rollers 9, l l and [3 from the driving source.

It will be observed from Fig. 5 that all of the paper in the continuously moving strip is utilized in the production of the blanks shown Fig. 1 so that there is absolutely no paper waste. In addition to the economies resulting from lack of waste, the machine is relatively simple and inexpensive and can be operated continuously at relatively high speed, thereby making possible the production of plant protectors in large quantities at very low cost.

Although the invention has been described with reference to a particular setup for manufacturing a plant protector of particular configuration, it is to be understood that certain modifications may be made in the machine disclosed without departing from the spirit of the inven tion and that the invention is to be limited only as set forth in the appended claims.

I claim:

1. In a paper gluing and cutting machine, means for continuously feeding a pair of paper bands, means for applying glue to one of said bands along diagonal strip areas thereon, means for thereafter pressing said hands together, whereby they adhere along said diagonal strip areas and means for thereafter cutting the said bands along the center lines of said strip areas, said cutting means comprising a rotating helical knife and an anvil roller positioned adjacent thereto and on the opposite side of said paper bands, whereby the bands are continually cut into double thickness blanks with the two thicknesses glued together adjacent their cut edges.

2. In a paper gluing and cutting machine, means for continuously feeding a pair of paper bands, means for applying glue to one of said bands along diagonal strip areas thereon, comprising a roller adjacent the moving paper band, said roller having a helical rib thereon for contacting said band as the bands feed therepast, means for applying glue to said rib prior to contact between said rib and band, means for thereafter pressing said bands together whereby they adhere along said diagonal strip areas, and

means for thereafter cutting said bands along the center lines of said strip areas comprising a cutting roller and an anvil roller between which said glued bands are continuously fed, the cutting roller having a helical knife edge projecting therefrom for cutting said band as the band feeds therepast, and means for driving said bands, said gluing roller and said cutting roller in synchronism whereby the cutting roller cuts the bands along the center lines of the glued strip areas.

3. A machine for manufacturing plant-protectors consisting of a pair of triangular paper blanks secured together along their lateral edges and slitted along their base edges, said machine comprising means for continuously feeding a pair of paper bands, means for applying glue to one of said bands along diagonal strip areas thereon, means for thereafter pressing said bands-together whereby they adhere along said diagonal strip areas, and means for thereafter cutting said bands along the center lines of said strip areas and slitting said blanks along their base margins, said cutting means including a cutting roller having a helical knife edge projecting therefrom and having a plurality of short knife edges projecting therefrom at each end, and an anvil roller for forcing said bands against said cutting roller with means for driving said knife roller, said paper and said glue applying means in synchronism.

4. A machine for continuously manufacturing double ply substantially triangular paper forms from continuous strips of paper, comprising means for continuously feeding a pair of paper bands, means for applying glue to one of said bands along diagonal strip areas thereon, successive glued areas extending laterally in opposite directions, comprising a roller adjacent the moving paper band, said roller having a pair of helical ribs thereon for successively contacting said band as the bands feed therepast, each of said ribs extending substantially half way around said roller in opposite directions and the ends of each rib adjacent the ends of the rollers lying closely adjacent the ends of the other rib,

means for applying glue to said ribs prior to contact between said ribs and band, means for thereafter pressing said hands together whereby they adhere along said diagonal strip areas, and means for thereafter cutting said bands along the center lines of said strip areas comprising a cutting roller having a pair of helical knives extending from the surface thereof substantially identical with the ribs on said first roller, an I anvil roller for pressing said bands against said cutting roller, and means for driving said bands,

said gluing roller and said cutting roller in synchronism whereby said cutting roller cuts the bands along the center lines of the glued strip areas.

WALTER R. SCHINDLER. 

